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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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  <body>
    <script>
      const date = new Date("2020-12-21 13:30:20");
      console.log(date.toLocaleString());
      // date.setMonth(0);
      // date.setDate(0); // 上个月最后一天
      // date.setDate(-10);
      // date.setHours(-40);
      // date.getDay() // 0-6
      console.log(date.toLocaleString());
    </script>
  </body>
</html>
